Nexus 1250 - Measurements and Calculations

Doc# E107706 2 - 8
2: Meter Overview
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
2.6: Measurements and Calculations
The Nexus® 1250/1252 meter measures many different power parameters.
Following is a list of the formulas used to perform calculations with samples for Wye
and Delta services.
Samples for Wye: v
a
, v
b
, v
c
, i
a
, i
b
, i
c
, i
n
Samples for Delta: v
ab
, v
bc
, v
ca
, i
a
, i
b
, i
c
Root Mean Square (RMS) of Phase Voltages: N = number of samples
For Wye: x = a, b, c
Root Mean Square (RMS) of Line Currents: N = number of samples
For Wye: x =a, b, c, n
For Delta: x = a, b, c
Root Mean Square (RMS) of Line Voltages: N = number of samples
For Wye: x, y= a,b or b,c or c,a
V
v
N
RMS
xt
t
N
x
¦
()
2
1
I
i
N
RMS
xt
t
N
x
¦
()
2
1
V
vv
N
RMS
xy
t
N
xy
tt

¦
()
() ()
2
1